If you want convert PST file into diffrent file formats you can use CloudMigration PST file Converter. This tool convets PST to EML, MBOX, OST, PDF, etc. it also migrate PST to Gmail, Yahoo Mail, AOL Mail, etc. You can download this tool in any windows version. It also provides free demo version.

Try switch PST to MBOX Converter Software, this tool not only supports PST files to MBOX Converter Online but also helps to convert PST to MSG, EML, EMLX, MBOX, and more. The application performs quick batch conversion of PST files to MBOX at one time with emails, and attachments. It is suggested to use the free demo of PST to MBOX Conversion for complete assessment and analysis of utility working. Refer:- https://www.softakensoftware.com/outlook-pst-converter.html

If you want to convert PST to EML file format then you can use the PST to EML Converter tool. It allows you to easily convert PST to EML file format. It provides 100 % error-free results and converts PST files into EML format with all the attachments. It can also convert PST file into different file formats. With the help of this tool, you can convert single as well as multiple PST files into EML at once. It also provides the free demo version to check how it works. 

If you want to convert Outlook PST file into various file formats then you can use the best Sysinfo PST Converter tool. It allows you to convert PST fille into various file formats such as MSG, PDF, EML, EMLX, etc. It maintains the original folder structure during the conversion process. It provides the preview feature to view the data before the PST file. The software is compatible with all the Outlook versions.